Diagnosing Spark Knock
What splug wires are you running?. If they are under 8mm follow the TSB on wire routing just to be on the safe side.
http://autorepair.about.com/cs/faqs/l/bl654h.htm
http://autorepair.about.com/cs/faqs/l/bl654h.htm
Stock wires I'll tripplecheck the plenum if its ok, I'll go ahead with the tune up and all that good stuff , if not , I'll fix it and then tune 
Thanks so much for your inputs!!

Thanks so much for your inputs!!




